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fly block

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noun Machinery, Nautical.
(in a Spanish burton or the like) a block, supported by a runner, through which the hauling part of the fall is rove.
any block that shifts with the movement of its tackle.
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Origin of fly block

First recorded in 1835–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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